I am thinking about what spice mix to put in a belgian wit. The plan is to add it all at flameout, here is what i have so far:

1 oz coriander
1 oz bitter orange
1 oz sweet orange

I want to add some star anise. How much is a good idea? I want it to contribute to complexity without overpowering things. And when in the boil is it best to add the anise? Also from the perspective of not overpowering things, do I have too much orange? What about adding some crushed black pepper? Again any info on when and how to add this stuff would be great, I've never put spices in beer before.

The go easy on the spices. They should be just almost there in flavor.

If you are going with the dried orange stuff, I really suggest not to. They still have the orange pith on them and make for a bitter brew that will take extra weeks to calm down in the bottle. The fresh is a good route, they get the idea across. use a vegie peeler to just get the zest without the white pith.

Don't worry to much about finding the bitter oranges. Just put a bit of grapefruit zest in to help balance it.

The best tool for zesting fruit bar none is the microplane. Vegetable peelers tend to take the pith too which as SnickASaurusRex pointed out is highly bitter and wholly undesirable. If this is a style you enjoy making this tool is $15 well spent and is available at any Bed Bath & Beyond.

If you freeze the fruit first. A peeler will skim right over the pith.

It is the little tricks like this that make masters in the kitchen (or brewhouse).

I zest 20 lemons for my limoncello liquor....

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Lots of good feedback here-- I can see that lots of folks are dubious about the bitter orange peel. Others have told me I should use it for authenticity and cut back on the hops to reduce bitterness. Thoughts?